Non-Newtonian granular fluids: Simulation and theory

Meheboob Alam, S. Luding

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

9 Citations (Scopus)

Abstract

Rheological properties of granular fluids are probed via event-driven simulations of the inelastic hard-sphere model. We find that granular fluids support large normal stress differences for the whole range of densities, clearly indicating their non-Newtonian rheology. Interestingly, both first (N 1) and second (N 2) normal stress differences undergo sign-reversals with density. While N 1 changes its sign in the dense limit, N 2 changes its sign in the dilute limit. The origin of such sign-reversals is tied to the microstructural reorganization of particles and to anisotropy in general. We briefly outline a viscoelastic constitutive model for granular fluids which allows the sign-reversals of both first and second normal stress differences.

Original languageEnglish
Title of host publicationPowders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media
Pages1141-1145
Number of pages5
Publication statusPublished - 1 Dec 2005
Externally publishedYes
Event5th International Conference on Micromechanics of Granular Media, Powders and Grains 2005 - Stuttgart, Germany
Duration: 18 Jul 200522 Jul 2005

Conference

Conference5th International Conference on Micromechanics of Granular Media, Powders and Grains 2005
Abbreviated titlePG 2005
CountryGermany
CityStuttgart
Period18/07/0522/07/05

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  • Cite this

    Alam, M., & Luding, S. (2005). Non-Newtonian granular fluids: Simulation and theory. In Powders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media (pp. 1141-1145)